Enhanced near‐infrared to green upconversion from Er 3+ ‐doped oxyfluoride glass and glass ceramics containing BaGdF 5 nanocrystals
Source abstract
Abstract
Abstract In this work, effect of glass composition as well as ceramization on visible and near‐infrared ( NIR ) luminescence properties along with their decay dynamics of Er 3+ ions has been compared considering two different oxyfluoride glasses yielding BaF 2 and BaGdF 5 nanocrystals. Both the glass systems have exhibited an intense normal and upconversion green emission under ultraviolet (378 nm) and NIR (978 nm) excitations, respectively. A remarkable enhancement of these emission intensities is observed for gadolinium‐(Gd) containing glasses. Interestingly, NIR fluorescence intensity from Er 3+ ions at 1540 nm has showed marginal decrease in gadolinium‐containing glass which is attributed to occurrence of strong excited‐state absorption ( ESA ) due to higher fluorine content ensuing an augmentation of upconversion green emission with a concomitant decrease in NIR emission. The quadratic dependence of upconversion green emission intensity on its pump power for all the samples revealed biphotonic absorption process from ground‐state 4 I 15/2 to the excited‐state 4 I 11/2 followed by ESA of second photon to the 4 F 7/2 level. The intense green upconversion emission as well as enhanced NIR fluorescence lifetimes indicate the suitability of these glass/glass ceramics for upconversion lasers and amplification in the third telecom window.
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Research context
OpenAlex topics: Luminescence Properties of Advanced Materials · Glass properties and applications · Solid State Laser Technologies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Glass Science and Technology Section Glass Division CSIR‐Central Glass and Ceramic Research Institute Kolkata India
Funding
Central Glass and Ceramic Research Institute
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